Scale



. Jan. 18,1927. 1,614,710

J. W. BRYCE SCALE Filed May l2 1921. 5 Sheets-Sheet 1 5 A y IHM Z4 Lr lm om@ Snowdon n. l 192 la 8 7 J. w. BRYcE SCALE Filed May 12, 1921 5Sheets-Sheet 2 nvemtoz I 5 Sheets-Sheet 3 IIIIII a lll/ lill i J. W.'BRYCE SCALE Jan. 1s, 1921. 1,614,110

Filed nay 12, 1921 5 sheets-sheet .4

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MAT, Ww-711mb.

' 1,614 710 Jan. 18, 1927. L w. BRYCE y SCALE Filed Ilay 12, 1921 5Sheets-Sheet 5 vvvvvv u A Suva/nto@ JW w .A711- Patented Jan. 18,1927..1

UNITED STATE Sf-iATENrOFF 1,614,710 ICF..A

JAMES W. BRYCE, F BINGHAMTON, YORK; ASSIGNOZR.,l BYMESNE .ASSIGNMENTSyTO DAYTON'V SCALE COMPANY, 0F DAYTON, OHIO, A CORPORATION OF NEWJERSEY'. f *A SCALE.

Application led May 12,

This invention/relates to improvements in weighing scales and is moreparticularly directed to improvements in load offsetting devices to theend that weighing operations may be carried expeditiously a'ndaccurately.

The detailed objects of the invention will be more fully set forth inthe accompanying specification and drawings and specifi-` cally dened inthe appended claims.

In the drawings,

Fig. 1 is a rear elevation View of the Scale with cover removed. l

Fig. 2 is an enlarged detail of t-he clutches and driving connections tothe weight car* 15 rier cam. i

Fig. 3 is a side view ofthe parts shown in Fig. 2.

Figs. 4 and 5 are detail views of the mechanical actuated time relays.

Fig. 6 is a detail view of the weight changing cam.

Fig. 7 is a detail view of one of the magnetically controlled clutches.

Figs. 8 and 9 are details showing the beam actuated contacts and thebracket for actuating the ,same from the beam.

Fig. 10 is a detail sectional view of the driving gearing for theweighing changing device.

Fig. 11 is an end view of these parts and their lassociated clutchmagnet.

Fig. 12 is a detail View of the differential device used in the gearingshown in section in Fig. 10.

Fig. 13 is a sectional top plan view of the scale beams and associatedweight carrier.

Fig. 14 is an enlarged detail View 'of the weight carrier and associatedscale beam.

Fig. 15 is a circuit diagram showing the entire set ot' electricalconnections.

The scale to which I have illustrated my invention as applied is of atype well known in the trade as an International No. 602 scale. It is tobe understood, however, that the present invention is not to be limitedto use in connection withthis particular form and type ot' scale andthat Athis particular l scale is used merely for convenience in il--lustration and description since its lgeneral construction and operationare well known in the art.

In general, the scale comprises a beam 2O fulcrumed at 21 and having anautomatic counterbalancing system such as pendulum 1921. serial No.468,835. y

22 .connected thereto. A draft rod 23 connects with the usual base leversystemand the Weight of the loadwmay be transmitted through anintermediate lever and linkage to the beam 20. A pivotal indicator 24suitably oper'ated from the beam displays the amount of the.automatically counterbab anced load.

When the applied load exceeds the capa@ ity" cf the' automaticcounterbalance additional loads may he offset by depositing one or morecapacity weights 25 upon the beam. These capacity weights are carriedbyv a weight carrier 26 which is journalled at 27 Aand counterbalancedbythe usual spring 27a. Thefamount of the load .offset by the Capacityweights is indicated upon a capacity Weight indicator, which is suitablyinterconnected to the Weight carrier to be variably displaced thereby inaccordance with the applied capacity weights. y

Heretofore it has been the practice to manually apply the capacityweights and to manually remove the same from the beam.

In the present invention I not only automatically apply the capacityweights as needed, when the live load exceeds the capacity of theautomatic counterbalance plus the amount of load offset by any capacityWeights already upon the beam, but I also automatically remove theweights as required. The capacity weights are either automaticallyapplied or removed as needed and the weight changes are effected withoutcarrying the weight carrier through any predetermined cycle such as one,for example, i

in which the complete set ot' weights must be applied or removed priorto the selection and removal or application of a single weight.

In order to aetuate the weight carrier I connect it with a rock lever 30which through a suitable cani follower is variably displaced by acontroller in the forni of a cam 31 upon shaft 32 (see Figs. 17 2, and14). The cam is arranged to be variably displaced so as to `cause theweight carrier to apply one or more weights to the beam and uponreversing the direction of "mot-ion of the cam the weights areautomatically removed by means of spring 27a. A power drive to lthe camis secured through bevel gearing 33 and spur gears 34 from a shaft 35.Shaft 35 is arranged to be selectively or rearwardly depending uponwhether (lll Gli

weights are to be applied or removed.

vTo control this operation and toflock the cam and associated parts indesired position between weight changing operations, I provide theconstruction which will now be described. Shaft has fastened to it thespider 36 of a differential gearing mechanism including vring gears37--38. Upon the vsleeve-like ends of these gears areV clutches 89 and40.

These clutches are best shown in `Figs. 7 10 and 11 and comprise jawelements il and 4-2, the former attached to gears 43 or 44 (Figs. 2 and11) and the latter 4.2 being splined on the sleeve-like ends of gears 37and 38 and are normally urged into clutching engagement by .springs 45.Disengagement of these clutches is secured by magnetically actuated arms4.6 which engage in -cam grooves in the clutch elements 42 and disengagethe jaws thereof. ,The

arms further serve to lock the clutch elements 42 in a. predeterminedposition when the jaws are disengaged (see Fig. 7).

Gears 43 and 4.1i are driften ino lposits directions by means of a motorM.' his motor is connected by suitable reducing gearing and shaft i7 toa crossshaft 47'? carrying two pinions 4S and e9. 'The former meshesdirectly with gear t vand the latter meshes with an idler 50 whichdrives gear 43 (see Fig. li).

It will be understood that there is an arm e@ for each clutch and thattwoclutch magnots 5l and 52 are employed. By energizing magnet 52 clutch39 will be engaged and the cani 3l will be driven forward. if, on theother hand5 magnet' 51 be energized, the cani 3l will be operated inreverse direction. Capacity weights will be successively ap pliedso'long as 52 remains energized and these weights will be successivelyremoved so long as magnet 5l. is energized. provided the motor M isrotating. lVith both magnets deencrgized, thc. weight carrier willremain stationary and be locked bythe clutch arms.

To control the energizationof the clutch magnets 5l and 52y I providecontrolling contact devices comprising adjustable contacts 53 and 54.-.These contacts are mounted in proximity to the beam and are actuated byan arm carrying a suitable insulatedv block thereon7 which extends fromthe scale beam 2l) (see Figs. i, 8 and 9). Suitablev provision is madefor adjusting these con tacts as shown in Fig. 8.- The contacts 53 areadapted to be closed when the counterbalance 22 reaches the limit of itstravel and 54: are closed by the beam when the beam recedcs to itsnormal no load position; (This position is likewise assumed by the beamwhen the applied load is overbalanced by the applied capacity Weights.)

The mode of operation of `the machine thus fardescribed may be bestunderstood by referring to the circuit diagram shown in Fig. 15.Electric current is supplied from a suitable source through main lines56 and 57. When a Weighing is to be made. a suitable switch58 such as apush button` is manually closed. If desired this circult may be closedautomatically by a. suitable draftrod switch 58 (Fig. l). Current nowflows from line 56 through the saidswitch 58, wire 59, mavnet 60,resistance 6l, and back to line. The energization of magnet 60 actuatesswitch 62 placing motor M in a circuit G3 across the llne. The motornowl commences to rotate and will be maintained in opera-tion after theopening of switch 58 by means of a stick circuit'which is establishedfromy line 57 through .resistance 6l, magnetG, wire 66, contacts G5, nowclosed., vWire 64 and bach to line 56. Under certain conditions7 thecontacts G5 may open at the commencement of an operation; but ifcapacity weights need be applied or removed these contacts will soonclose and thereafter the stick circuit will be established andmaintained. The operator under these conditions maintains 58 closeduntil the stick circuit is established by the closure of contacts 65.After the stick circuit is established the motor M Will continue torotate until contacts 65 are opened.

l If a load be of such amount that the contacts 53 be closed signifyingthat a capacity weight is needed, a. circuit will be established througha wire 67, contacts 53 now closed, contacts 68 now closed, Wire G9,controlling magnet 70, wires 7l and 72 and back to the other side ofresistance 6l. I find that it is desirable to prevent excessive voltageacross the controlling contacts and by tapping the Contact circuit G7-72across a part of the resistance Gl undesirable voltages at the contactsare prevented, The magnet 7() being energized attracts its armatureupwardly and engages a pointed plunger 73 in the threads of a slowrotating shaft 7l. This shaft in geared connection with shaft 47 (seeFig. 2) and arranged to slowly feed the pointed plunger laterally to theright and aftcr the lapse of alrinterral .of time to causo it to Yclosecontacts 75. The detailed arrangement of this type of n1echanicallydelayed relay are shown in Fig. 4 and corresponding reference characterswill bc employed when it is refe-fred to hercafter, suitable prefixesbeing employed to distinguish the parts.

The closure of contacts 75 establishes a circuit from line 57, wire 7 6,clutch magnet 52, contacts'75, wire 78s magnet 70h. wire 7 9, resistanceand bach to line 56. The clutch magnet then clutches the motor to thecam 3l which actuates the capacity weightl chang ing device and weightsare successively appliedu'ntil the beam vmoves away fromand openscontacts 53. With these contacts open, magnet 'willimmediately becomedeenergized allowing plunger 7 3 to drop away trom the screw shaft andpermit contacts `7 5 to open. The clutch magnet will be then deenergizedand further application of capacity weights will be stopped.

As an incident to the foregoing operation, magnet 7 OP is energized.Plunger 73h is normally heldin engagement with thescrew thereof are`important for a proper operation of this type of scale since if thecontacts 53 directly controlled the magnet 52 this magnet would beenergized at improper times due to beam preliminaryoscillation and onvaccount -of other wagrant contacts. This feature of my inventionlbroadly is `claimed in mv copending applciation, Se-

rial No. 469,834, aied May 12, 1921. The. speci'fic'relay embodimentwith a slow rotating shaft and a positively timed mechanical delay1ofclosure is herein claimed.

If sufficient load be partially or entirely removed from the scale sothat the beam 20 closes contacts 54:, a circuit will be establishedthrough 67, contactsv54, contacts 81 now`closed, wire 82. magnet 70"lland back to line. The energization of magnet 70a after a lapse of timecloses contacts and establishes a circuit to clutch. magnet 51 wherebyweights are successively removed from the beam until the beam moves awayfrom the contacts 54. If this operation is attempted after the motor hasstopped its rotation, it will be first necessary to close the pushbutton 58 and reenergize the motor controlling magnet 60.`

It may occur that the applied load isl greater than the combinedroffsetting capacity of all of the capacity weights plusftheoffsetting-capacity of the automatic counterbalance. To ystop theoperation under these conditlons, I'providethe contacts 68 which arearranged to be opened by the weight carrier 26' when the latter reachesthe ex- A'bin'ation with an lautomatically counterbaltreme limitof itstraveland has applied' all of its weights. The opening of contacts 68interrupts the circuit69 to magnet70 and' stops the roperation of themachine.l

It Amay likewise occur that inadvertently.

after a weighing operation is completedalthat After the clutch magnetcirthe tare-poise 83 (Fig. 13) may have'been left by theV operator indisplaced position upon the-tare 'beam 84. Under such' condi` tions thebeam would be held vfirmly against the contacts 54 and would maintainthese contacts closed even afterthe load was removed. Under theseconditions the motor would tend to continue to run to remove imaginarycapacity weight-s from the beam. T0 prevent this action I provide limitcontacts 81 which are opened by the weight carrier when it is in extremeupper position.

On these scales, it is also desirable to provide a means for readilyapplyingall ot the weights to the beam, when it is desired to load upthe beam and prevent shocks upon the upper mechanism from suddenlyapplied loads. It is also` desirable to provide a means for removing allof the capacity weights for testing the zero of the scale. For thispurpose, I provide a two way switch l connected to wire 67 which cani bethrown to upper position to short circuit contacts 53 when all weightsare to be applied. The saine switch, when thrown over to its lower poleshort circuits contacts 54 and removes all the weights from the beam.

When the foregoing switch 85 is used the limit contacts 68 and 8l willlimit the eX- treme movement of the weight carrier and open the clutchcircuit.

- When the slow relay 7 (lb-7 3 etc. has been f so actuated as to opencontacts 65, all circuits in the machine will be open so that there willbe no current consumption with the machine at rest. This will beunderstood since when magnet 60 is deenergized there will b e no iow ofcurrent across resistance 61 and consequently-there will be nov currentflow in the circuits 69 and 82. Magnets 70 and 70a will then both bedeenergized allowing the plungers 73 and 73a to both drop to lowerposition opening contacts 75 and 7 5a and thereby stopping further flowof current.

What I claim is 1. ,In a weighing scale, in combination with a scalebeam, a plurality of load oil'- setting weights, .means for applyingsaid weights to the beam and for removing` them therefrom. a powerdriving means, and automatically operable means comprising in partelectriccontact devices actuated bythel beam for alternatively actuatingthe weight applying means by said power driving means. to apply weightsto said beam or to posi'' tively control the removal of weightstherefrom.

l2. A weighing scale comprising in coinforce to said beam for increasingthe ycapacity of the scale Ibeyond 4the range ofthe automaticcounterbalance capacity weight additional 'weights and means including Yelectric contact devices actuated bv the beam for controlling theoperation of the motor and of the weight changing devices so as toeffect either an initial removal or application of additional weights asre uired.l

3. In a weighing scale, in com4 ination, a scale beam, an automaticcounterbalance therefor, capacity weights adapted to be applied to saidbeam for increasing the capacity `of the scale beyond the range of theautomatic counterbalance, a capacity weight changing mechanism, acontroller therefor, a driving motor` driving connections from the motorto the controller, and electric contact devices controlled by said beamto control the adjustment of said driving connection, whereby weightsmay be optionally and directly applied or removed according tothestat-us of the beam.

4. In a weighing scale of the automatic type having a scale beam,capacity weights for application thereto, and a capacity "weightapplying means, in combination, a

motor, means actuated thereby7 for advancing the capacity' weightapplying means to deposit weights upon the beam, said means whenactuated reversely by the motor permitting the removal of capacityWeights therefrom. and means operated bv the beam for selectivelycontrolling the direction of drive of the aforesaid means wherebyweights may be selectively applied or removed as needed.

y5. In a weighing scale of the automatic type having a capacity weightchanging device with provisions for removing or applying capacityweights to a part ofzthe scale, in combination with a scale bcannadriving motor, means for actuating the capacity vweight devicetherefrom, said means comprising a pair of clutch devices and means forselectively engaging one or the other of the same to apply or removecapacity weights.

6. In a weighing scale having a scale beam and a capacity weight loadoffsetting means therefor, said means including capacity weights adaptedto be applied or removed to or from a moving part of the scale` and.

n'ieans for applying or removing the same, a motor. forward and reversedriving devices intermedi ate the motor and said means` and electricalcontact devices actuated by said beam for selectively controlling said.connections.

7. In a weighing scale having a scale beam, an automatic counterbalance,and a capacity weight load offsetting means, capacity weight-s adaptedto be applied or removed to or from a moving part of the scale, a motor,driving devices ,froml said motor to said mean-s, anda pair of clutchesassociated therewith for selectively controlling the direction ofactuation of the said load olfsetting means, and means for selectivelyac l tuating one orthe other of the said clutches according .to 'theposition of the beam, to either remove or apply capacity weights, andmeans for controlling the disengaging ofthe said clutch when the propercapacity weights have been removed or applied to l the beam. L r Y 8.In'alweighingscale, in combination, ak scale beam, an, automaticcounterbalance therefor, a capacity weight load offsetting means,capacityweights adapted to be applied or removed to or from a movingpart` 9. In a device of the class described, a

scale beam, a load offsetting means therefor, and means for controllingthe operation thereof, said means including a driving motor, a partdriven thereby, a contact device actuated by the scale beam. a circuittherefor, a control circuit and a timed relay mechanically actuated bythe part driven by the motor and having a controlling magnet energizedupon the closure of the iii-st circuit for establishing the controlcircuit after a certain time period.

l0. In a. device of the class described, in combination, a scale beam, aload offsetting means therefor, means foi` controlling the operationthereof comprising a pair of contacts actuated by the beam, contactcircuits therefrom, a controlling circuit, a switch for saidcontrolcircuit, and means for actuating'said switch at a delayed time periodafter the closure of the beam actuated contacts, said means comprising amagnet con` trolled by the contact circuit, and a'mechanically actuatedmember `controlled thereby and mechanically displaceable to actuate thecontrol switch after the lapse of a predetermined time. A

11.111 al weighing scale, a scale beam, load offsetting means, a motorfor controlling thesame, control means for said motor.

vincluding beam actuated contacts, na cir` cuit therefrom, a secondcontrol circuit and a slowl acting magnetically controlled mcchanicalrelay actuated mechanically by said motor to delay the closure of thecontrol circuit for a predetermined period after the closure of thecontact circuit.

12. In la weighing scale, in combination,

, of the carrier by the motor, said devices,

lll

including beam actuated contacts and circuits, and limit switch devicesto interrupt the said circuits irrespective of the conditionof the beamactuated contacts upon the Weight carrier assuming an extreme position.

13,'In a Weighing scale, in combination, a scale beam, a plurality ofcapacity Weights, a capacity Weight carrier adapted to de-y posit one ormore Weights upon the beam, and remove the same therefrom, a motor fordriving the said carrier, means for controlling the said driving of thecarrier, said means comprisin by the beam, an supplementary manually7operated switch devices having provisions for controlling the motor andadapted when operated to cause the motor to drive the carrier to anextreme position for the purpose described.

14. In a Weighing scale lhaving a beam i and an associated capacityWeight carrier,

Yas

capacity Weights therein for application to said beam, a motor fordriving the same, and electrical controlling devices actuated by thebeam for establishing or breaking the driving connection between themotor and the carrier, said devices including a manually operable switchadapted to be operated to one position to cause all the Weights' to beapplied to the beam and adapted for operation to another positionk tocause all the weights to be removed from the beam.

15. In a weighing scale, in combination, a beam and an lassociatedWeight carrier, capacity weights therein for application to said beam, amotor for driving the same, and electrical controlling devices actuatedby a moving part of the scale for coupling and uncoupling the motor andthe said carrier, and limit contact devices actuated by the Weightcarrier to effect the uncoupling of the driving motor When the Weightcarrier has reached its limit of travel.

' 16. Inav Weighing scale comprising a scale beam, an automaticcounterbalance, a capacity Weight carrier, capacity Weights therein forapplication to said beam, a controlling cam, a motor, forward 'andreverse clutches intermediate the motor and said controlling cam,electric controlling .devices for said clutches, said devices includinga plurality of controlling cont-acts actuated by the beam, said contactswhen actuated selectively controlling the selection of the clutches tobe engaged and when opened by the retraction of the beam causing thedisengagement of both clutches.

17. In a weighing scale in combination cont-act devices actuatedvvithascale beam.,l a. capacity Weight carr 1e`r, capacity Weights therein forapplicationl to said beam, a motor for driving the "same, a plurality bf`driving 'connections intermediate theI motor andsaid carrier adapt-- edtodrive the carrier forward or reversely, magnetically controlledclutches Withv each oi' said connections, and controlling devicestherefor actuated `by said beam and adapted when the beam is'in oneposition toen,-

vgage one clutch, when the beam is in another position to .lengage theother clutch, and when the beam is in intermediate position to disengageboth clutches.

18. In a weighing scale, in combination rier,V capacity Weights thereinfor applica- `with a scale beam, a capacity Weight cartion to ysaidvbeam, of an actuating motor j therefor, clutch devices -and'means forselectively operating'the same to couplel the motor and the carrier andadvance or return the same, and a pair of contact devices actuated bythe' beam, one contact when actuated selecting one clutch and the othervselecting the other clutch.

19. A'vveighing scale comprising an automatically lcounterbalanced scalebeam, cap-acity Weights adaptedi to be applied or removed from partsvassociated With said scale beam, capacity Weight changing devices,-

moving or applying capacity Weights, a controlling element for said lastmentioned either an initial removal or application ot' Weights asrequired.

20. In a weighing scale having capacity Weight changing devicesincluding means for applying or removing one or more Weights to or fromparts` operatively associated with the weighing'scale,'and means forcontrolling the operation thereof to effect either the automatic removalofor the automatic application of Weights, Without manual intervention,in combination with means brought into operation by the position ofcertain parts of the scale. for automatically interrupting the operationvot the Weight changing devices upon the application of all theWeightstlierebyQ f 21. In a Weighing l'scale having capacity Weightchanging devices which apply or remove one or more weights one aftertheother to or from the Weighing scale and means for automaticallycontrolling the operation thereof" in accordance with applied' loads toeffect automatic removal of or auto- -matic application of Weights, andmeans 'means for operating the same for either removal of theilastweight -for automatically interrupting the operation of the weightchanging devcesi.

22. In a Weighing scale having in combination capacity Weight changingdevices which apply or remove one or a plurality of Weights to or fromoperative parts of the Weighing scale and means `controlled by the scalefor automatically controlling the-operation of the same to eiect eitherthe removal or application of weights, and meansv for rendering theaforesaid `rcon'trolling means inoperative to permit the application ofall of the Weights when desired.

23. ln a Weighing scale having in com bination capacity weight changingdevices which apply or remove one or a plurality of weights to or fromoperative parts of the scale 'for automatically controlling theoperation of the same to effect either the re- `mo'val 'or applicationof weights, and means 24. Ina Weighing scale having in com# binationcapacity weight changing devices which apply'or remove one or aplurality of weights to or from operative parts of the Weighing scaleand means controlled by the scale for automatically controlling theoperation of the same to eil'ect either the removnl or application .ofWeights, and means for rendering the aforesaid controlling meansinoperative to permit the weight changing devices to be alternativelyactuated to automatically apply or remove all of the weights as desired.Weighing scaleand means controlled by the 'In testimony whereof IheretoA a'iiix my signature.

e l JAMES WV. BRYCE.

